Basic Qualification · B-003 Station assembly, practice and safety · B-003-018-005
What is the minimum electrical current that can be fatal to the human body?
- A 1 ampere
- B 2 amperes
- C 20 milliamperes
- D 500 milliamperes
Correct answer: C — 20 milliamperes. From the official ISED question bank, verified word for word.
Why
As little as 20 milliamperes of electrical current can cause muscle paralysis or stop your heart, making it a potentially fatal level for the human body. The full explanation — and one for every question — is in Pro.
Practise this section
Building a station safely: power supplies, grounding, RF exposure, lightning, feedline routing, and what a transmitter, receiver and transceiver actually do.